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Shopify B2B Development Agency

Shopify B2B Development.

Built by operators, not consultants. ECommerce Partners is a Shopify B2B development agency that builds wholesale portals, company accounts, customer-specific pricing and ERP-connected ordering on Shopify Plus, with 25+ years of ecommerce experience and our own B2B app on the Shopify App Store. The portals we build fit how your buyers actually buy.

Best for: manufacturers, distributors and brands selling wholesale alongside retail, typically $3M or more a year, with price lists, payment terms or an ERP that has to stay in sync.

Page last updated October 8, 2026.

50K+

SKUs in B2B Catalogs

25+

B2B Implementations

15+

ERPs Integrated

25+

Years of Ecommerce

Why ECP for B2B

Four things you won’t find at most Shopify B2B agencies.

01

25+ years building ecommerce.

Founded in 1998, long before Shopify existed. We’ve shipped on Magento, BigCommerce, and Shopify across two decades. That history shows up in how we architect for scale and the platform shifts we plan around.

02

We built our own B2B Shopify app.

We built the B2B Buyer Portal app to fill a gap in native Shopify B2B: company main contacts can’t manage their own users without filing support tickets. Available on the Shopify App Store to all our clients, the app lets their customers add, remove, and manage users themselves.

03

Built by operators, not consultants.

Our founder ran his own retail stores and ecommerce operations before founding ECP. We know what it’s like on your side of the table. Peak season pressure, ERP integrations that break, a CEO asking why the launch slipped.

04

Deep migration expertise.

Dedicated migration playbooks for Magento, BigCommerce, WooCommerce, and Salesforce to Shopify Plus. If your B2B store is on a legacy platform, we’ve done your migration before.

What We Build

Full-stack B2B ecommerce on Shopify.

We’ve been building B2B on Shopify since Shopify Plus launched its native B2B features. We use the native stack where it’s strong, and we extend Shopify where your business needs more.

Company Accounts & Buyer Hierarchies

Multi-user company accounts, role-based permissions, location-based access, and self-service buyer management. Buyers manage their own teams without your team filing tickets.

Custom Pricing & Catalogs

Customer-specific price lists, volume tiers, contract pricing, and exclusive product catalogs. From simple percentage discounts to complex tiered pricing matrices.

Payment Terms & Credit Workflows

Net 15, 30, 60, and 90 payment terms with automated invoice generation. Credit application workflows, approval queues, and integration with your AR systems.

Bulk Ordering & Quick Order Forms

SKU-based quick order entry, CSV upload, saved order templates, and reorder-from-history flows. Built for buyers who order the same 200 SKUs every Monday.

ERP & Backend Integrations

NetSuite, SAP, Microsoft Dynamics, AS400, custom in-house systems. Inventory sync, order push, customer and pricing sync, designed to survive ERP downtime.

Quotes, Approvals & Workflows

Quote request flows, internal approval queues, sales rep assignments, and draft orders. The infrastructure for actual B2B sales motions, not just self-service checkout.

Large & Complex Catalogs

10K to 50K+ SKUs with variant configurations, technical specs, datasheets, and B2B-specific product attributes. Catalog architecture that scales.

Shipping, Tax & Fulfillment

Custom shipping rules per company, tax-exempt customer handling, multi-warehouse fulfillment, and integration with 3PLs. B2B logistics is rarely simple.

Unified B2B + DTC

Run wholesale and direct-to-consumer from one Shopify store, with separate experiences for each. One admin, one inventory, two distinct checkout paths.

Who We Work With

B2B businesses doing $3M+ where ecommerce is the operation.

Distributors

Selling to retailers, dealers, and resellers across a network of buyers.

Manufacturers

Direct-to-trade sales channels with their own catalog and pricing logic.

Wholesalers

Multi-channel wholesale operations with both small-account and key-account buyers.

Brands with B2B + DTC

Consumer brands also selling to retailers, gifting partners, or corporate accounts.

Our Own Product

The B2B Buyer Portal app.

We built our own Shopify app to fill a gap in native B2B: true buyer self-service. Company main contacts can add and remove users, manage locations, and assign permissions without ever filing a ticket with your team.

Available on the Shopify App Store at $39/month for any Shopify Plus merchant. Built on Shopify’s new customer account system and integrated with native B2B Companies, Catalogs, and Locations.

What the app handles for you:

  • Self-service user management by buyers
  • Add and remove shipping locations independently
  • Location-based user permissions
  • Built on Shopify’s new customer accounts
  • Works with native B2B Companies, Catalogs, Locations
  • Reduces B2B support tickets significantly
Our Approach

How a B2B project actually goes.

Every B2B engagement starts with discovery, ends with launch, and is honest about the messy middle in between. Here’s the shape of it.

01

Discovery

2 to 4 weeks. We map your B2B sales process, catalog structure, pricing logic, ERP integration points, and buyer workflows. Output: a detailed scope, architecture doc, and timeline.

02

Design & Plan

UX for buyer-facing flows, technical architecture for integrations, data migration plan. We design for the actual buyers, not theoretical ones.

03

Build & Integrate

Theme development, custom apps and Functions, ERP integration, data migration, B2B catalog setup. Senior developers, not handoffs to juniors.

04

Launch & Optimize

Phased rollout with select customers first, full launch, and ongoing optimization. Most clients stay on a retainer for years of continued development.

B2B FAQs

Questions we hear from B2B buyers.

Native B2B features (Companies, Catalogs, payment terms) are now available across all Shopify plans, not just Plus. Shopify Plus adds higher API limits, multi-store support, checkout extensibility, and enterprise-grade SLAs. For brands doing $3M+ in revenue with complex B2B workflows, Plus is usually the right call. We help clients evaluate the right plan during discovery.

Yes. We routinely build Shopify B2B stores with 10K to 50K+ SKUs and customer-specific pricing through Shopify’s native Catalog system, which assigns custom price lists per company. For more complex pricing (volume tiers, contract pricing, rep-managed discounts), we extend Shopify with Functions or custom apps. QC Supply runs 50K+ SKUs with full customer-specific pricing on the platform we built.

ERP integration is one of our core capabilities. We’ve integrated Shopify with NetSuite, SAP, Microsoft Dynamics, AS400, and custom in-house systems. Most B2B clients need at least one-way inventory sync, order push, and customer/pricing sync. We design the integration to be reliable, auditable, and resilient to ERP downtime.

Shopify’s B2B terms come from a fixed set of options, such as net 30 or net 60, applied to each order. Two things usually need more: terms outside that set, such as end of month, and a credit limit across all of a customer’s open orders, which Shopify does not enforce on its own. There are several ways to handle both, from an app to a check against your ERP or accounting system, and the right one depends on your business rules. Sometimes the simplest answer is to change the rule: one wholesale client moved its terms to match Shopify’s options because that cost far less than building around them.

Yes, and most of our clients do exactly this. Shopify B2B and Shopify online stores run from the same admin, with B2B buyers seeing their logged-in catalog and pricing while DTC shoppers see retail pricing. The complexity is in the implementation: distinct experiences without conflicting checkout flows, separate URL structures where needed, and clean access control for B2B-only product visibility.

Standard B2B implementations (small to mid-sized catalog, native Shopify features only, basic ERP integration) typically take 12 to 16 weeks. Complex builds with 10K+ SKUs, multi-system integrations, custom workflows, and a parallel DTC experience usually run 20 to 30 weeks. Every project starts with a 2 to 4 week discovery phase that produces a detailed timeline, scope, and architecture document.

Company accounts with multiple buyers and locations, customer-specific price lists and volume rules, net payment terms with credit limits, fast reordering from order history or a quick-order form, and an ERP connection so stock, pricing and invoices match what the back office says. Shopify's native B2B covers companies, catalogs and terms. What buyers usually miss is self-service user and location management, which is why we built the B2B Buyer Portal app.

Yes. Most B2B clients keep us on a monthly retainer for new buyer features, ERP changes and priority emergency support, because a wholesale store changes every time the sales team signs a new type of account. We also take over support for B2B stores other agencies built, starting with an audit of the integrations and the pricing logic.

Usually most of it, and the parts you cannot keep are the ones worth replacing. We map every function of the current portal to native Shopify B2B, an app, or custom development, so nothing is lost by accident. Our guide to keeping a customer portal intact through a Shopify migration walks through that mapping function by function.

Ready to build B2B that actually works for your buyers?

Whether you’re replatforming off Magento, scaling an existing Shopify Plus B2B store, or starting from scratch, let’s talk about what you need.